Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-05-15
2003-05-20
Chervinsky, Boris (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S069000, C310S090000, C417S423130, C417S423140
Reexamination Certificate
active
06567268
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a cooling fan, and more particularly to a cooling fan with magnetic liquid to prevent lubricant in a bearing from escaping.
2. Description of Related Art
A conventional cooling fan for reducing a temperature of an electric element such as a CPU, generally has a self-lubricating bearing provided therein. The bearing has lubricant provided therein and oil-seals for preventing the lubricant from escaping the fan. However, after a term of time, lubricant will still leak out because the sealing effect of the oil-seals is not good. Thus, friction between the spindle and the self-lubricating bearing is high and a use life of the cooling fan is short.
Therefore, the invention provides an improved cooling fan to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a cooling fan that has magnetic liquid provided therein for preventing lubricant in a bearing from escaping.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4519010 (1985-05-01), Elsaesser et al.
patent: 4604665 (1986-08-01), Muller et al.
patent: 4629919 (1986-12-01), Merkle
patent: 6118658 (2000-09-01), Nakase
patent: 6236129 (2001-05-01), Yamashita
patent: 6394768 (2002-05-01), Fukuda et al.
Chervinsky Boris
Varndell & Varndell PLLC
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